light buzzing sound from car when put into D
 

yes its an automatic. roast me. anyways when I put my car into D I hear a buzzing sound. only hear it when I start the car while its cold. when the car warm up n I turn it on n put into D I don't hear the sound. its not loud and its doesn't last long. maybe 2 - 3 seconds. but what could the buzzing sound be. my transmission?

if it is :suicide:

bump